Hi all, I'm looking at implementing target attributes for aarch64 and I have some questions about the hooks involved. I haven't looked at this part of the compiler before, so forgive me if some of them seem obvious. I couldn't figure it out from the documentation (https://gcc.gnu.org/onlinedocs/gccint/Target-Attributes.html#Target-Attributes)
* Seems to me that TARGET_OPTION_VALID_ATTRIBUTE_P is the most important one that parses the string inside the __attribute__ ((target ("..."))) and sets the target-specific flags appropriately. Is that correct? * What is TARGET_ATTRIBUTE_TABLE used for? It's supposed to map attributes to handlers? Isn't that what TARGET_OPTION_VALID_ATTRIBUTE_P is for? * What is the use of TARGET_OPTION_SAVE and TARGET_OPTION_RESTORE? Is that used during something like LTO when different object files and functions are compiled with different flags? Are these functions just supposed to 'backup' various tuning and ISA decisions? * Is TARGET_COMP_TYPE_ATTRIBUTES the one that's supposed to handle incompatible attributes being specified? (for example incompatible endianness or architecture levels)? Thanks for any insight, Kyrill